linux-kernel - [PATCH 1/2] trace,x86: Add tracepoint to x86 timer interrupt handler

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Date:	Fri, 29 Jul 2011 16:59:37 -0700
From:	Vaibhav Nagarnaik <vnagarnaik@...gle.com>
To:	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>
Cc:	Michael Rubin <mrubin@...gle.com>,
	David Sharp <dhsharp@...gle.com>, linux-kernel@...r.kernel.org,
	x86@...nel.org, Vaibhav Nagarnaik <vnagarnaik@...gle.com>
Subject: [PATCH 1/2] trace,x86: Add tracepoint to x86 timer interrupt handler

The x86 timer interrupt handler is the only handler not traced in the
irq/irq_handler_{entry|exit} trace events.

Add tracepoints to the interrupt handler to trace it.

Signed-off-by: Vaibhav Nagarnaik <vnagarnaik@...gle.com>
---
 arch/x86/kernel/time.c |   15 +++++++++------
 1 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/time.c b/arch/x86/kernel/time.c
index 5a64d05..74d2280 100644
--- a/arch/x86/kernel/time.c
+++ b/arch/x86/kernel/time.c
@@ -51,6 +51,13 @@ unsigned long profile_pc(struct pt_regs *regs)
 }
 EXPORT_SYMBOL(profile_pc);
 
+static irqreturn_t timer_interrupt(int irq, void *dev_id);
+static struct irqaction irq0  = {
+	.handler = timer_interrupt,
+	.flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
+	.name = "timer"
+};
+
 /*
  * Default timer interrupt handler for PIT/HPET
  */
@@ -59,7 +66,9 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
 	/* Keep nmi watchdog up to date */
 	inc_irq_stat(irq0_irqs);
 
+	trace_irq_handler_entry(irq, &irq0);
 	global_clock_event->event_handler(global_clock_event);
+	trace_irq_handler_exit(irq, &irq0, 1);
 
 	/* MCA bus quirk: Acknowledge irq0 by setting bit 7 in port 0x61 */
 	if (MCA_bus)
@@ -68,12 +77,6 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static struct irqaction irq0  = {
-	.handler = timer_interrupt,
-	.flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
-	.name = "timer"
-};
-
 void __init setup_default_timer_irq(void)
 {
 	setup_irq(0, &irq0);
-- 
1.7.3.1

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